Hagsand, Olof and Marsh, Ian and Hanson, Kjell (2003) Sicsophone: a low-delay Internet telephony tool. In: 29th Euromicro Conference (EUROMICRO'03), Sep 2003, Belek, Turkey.
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Official URL: http://doi.ieeecomputersociety.org/10.1109/EURMIC....
The end to end delay is a critical factor in the perceived quality of service for Voice over IP applications. Sics ophone is a complete VoIP system that couples the low level features of audio hardware with a standard jitter buffer playout algorithm. Using the sound card directly eliminates intermediate buffering as well as providing fine control over timers needed by a soft real-time application such as VoIP. A statistical based approach for inserting packets into audio buffers is used in conjunction with a scheme for inhibiting unnecessary fluctuations in the system. We also present mouth-to-ear delay measurements for selected VoIP applications and show that several hundreds of milliseconds can be saved by using the techniques described in this paper. A prototype for both UNIX and Windows platforms has been implemented, demonstrating that our system adapts to network conditions whilst maintaining low delays.
|Item Type:||Conference or Workshop Item (Paper)|
|Deposited By:||INVALID USER|
|Deposited On:||07 Apr 2008|
|Last Modified:||18 Nov 2009 16:14|
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